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OK, I picked up a twin drive apparition that was like new (and it was) and have run it about 5 times now. Wondering if anyone here has experience with this boat.
I have run it only on 3s, as that is what it says to run it on. The batteries were 3s-2200-20/30c zippy's. Not overly impressed with the speed, it runs right around 33-34mph but the hull barely seems to really get out of the water at that point. I tried raising the drives, but that unloaded the motors and slowed it down to about 31mph. Have run the batteries all the way towards the back and COG looks ok.
The current if i remember correctly was in the mid to high 30's, will have to check the eagle tree again.
I took that cheap rudder off and put a more scale like one on, looks better now.
The motors are still the stock 380-2881's. On 3s rpm should be right around 30k.
ESC's are reworked for cooling. I inspected them and sure enough, the shrink wrap is coming loose around the caulk sealing them up. So, I open them up and pull the heat sinks. Standard quality, only about a 1/3 of the fets are even touching the thermal tape. So I carefully file the FETs and reseat the coolers with thermal paste, then seal the whole thing in epoxy. Now they are cooled well, but they do not even get warm after a full run.
So now my question: Do I just sell this thing (it is mint and better than new) and finish my skunk cat? Or do I look at trying to increase the speed some and how? 4s seems a bit much for cheap motors, you are talking 40k range here! Do I stick with 3s, but get better batteries or make a harness up to run 3 in parrallel for both motors (total of 6600 in the boat). or do I start going up in prop size to get the speed and increase this until my amperage gets to where it should be? I mean, they are rated at 70 amps and I am half that.
My problem is that I am pulling about 70 amps total and I have a 34mph - 32" cat. A single drive would be much better at this point than the twin.
So, anyone play with one of these? Most here have bought them for just the hull and put in new stuff.
Brian
Added info to original post: The props are stock. i sharpened and ballanced them, so they run nice. But they are only 35mm, 2 blade, NON-Counter Rotating
The COG is 9" in front of the sponson transoms. rest of hull is 28.5" long, so that is 32% of hull. Maybe too far forward? It is planing, but not skimming the water. Could also be the non-CR props.
I have run it only on 3s, as that is what it says to run it on. The batteries were 3s-2200-20/30c zippy's. Not overly impressed with the speed, it runs right around 33-34mph but the hull barely seems to really get out of the water at that point. I tried raising the drives, but that unloaded the motors and slowed it down to about 31mph. Have run the batteries all the way towards the back and COG looks ok.
The current if i remember correctly was in the mid to high 30's, will have to check the eagle tree again.
I took that cheap rudder off and put a more scale like one on, looks better now.
The motors are still the stock 380-2881's. On 3s rpm should be right around 30k.
ESC's are reworked for cooling. I inspected them and sure enough, the shrink wrap is coming loose around the caulk sealing them up. So, I open them up and pull the heat sinks. Standard quality, only about a 1/3 of the fets are even touching the thermal tape. So I carefully file the FETs and reseat the coolers with thermal paste, then seal the whole thing in epoxy. Now they are cooled well, but they do not even get warm after a full run.
So now my question: Do I just sell this thing (it is mint and better than new) and finish my skunk cat? Or do I look at trying to increase the speed some and how? 4s seems a bit much for cheap motors, you are talking 40k range here! Do I stick with 3s, but get better batteries or make a harness up to run 3 in parrallel for both motors (total of 6600 in the boat). or do I start going up in prop size to get the speed and increase this until my amperage gets to where it should be? I mean, they are rated at 70 amps and I am half that.
My problem is that I am pulling about 70 amps total and I have a 34mph - 32" cat. A single drive would be much better at this point than the twin.
So, anyone play with one of these? Most here have bought them for just the hull and put in new stuff.
Brian
Added info to original post: The props are stock. i sharpened and ballanced them, so they run nice. But they are only 35mm, 2 blade, NON-Counter Rotating
The COG is 9" in front of the sponson transoms. rest of hull is 28.5" long, so that is 32% of hull. Maybe too far forward? It is planing, but not skimming the water. Could also be the non-CR props.
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